Real-Time RFID Localization Using RSS Kirti Chawla, Christopher McFarland, Gabriel Robins, Connor Shope Presenter: Christopher McFarland [cem8u@virginia.edu]

Background The necessity for locating objects Limitations of current solutions: Expensive equipment Nontrivial computational processing Unrealistic constraints

Objective Simple! To locate objects in a given environment Criteria for a successful system: Adaptive Scalable Accurate Fast Realistic

Why RFID? Scalable Wide range of environments Remove unrealistic constraints? Deliver next generation of localization services

Sneak Peek Our proposed solution How?

A Key Insight Ideal tag-reader pairs unlock higher performance

Performance-Enhancing Heuristics Real-Time Localization Framework Tag Selection Tag Binning RSS Decay Models Performance-Enhancing Heuristics Problem Brands of tags have variable performance Solution Select tag brands based on performance

Performance-Enhancing Heuristics Real-Time Localization Framework Tag Selection Tag Binning RSS Decay Models Performance-Enhancing Heuristics Problem Tags of the same brand have variable sensitivities Solution Bin tags based on their sensitivity

Performance-Enhancing Heuristics Real-Time Localization Framework Tag Selection Tag Binning RSS Decay Models Performance-Enhancing Heuristics Problems RF signal variability renders the Friis Eqn. useless Environmental effects affecting RSS

Performance-Enhancing Heuristics Real-Time Localization Framework Tag Selection Tag Binning RSS Decay Models Performance-Enhancing Heuristics Solution Inspired by the Friis Equation [ThingMagic, Tag-10] RSS = -53.17D0.29 Friis Eqn. General Form Eqn. RSS = CDE [Alien, Tag-14] RSS = 3246.76D-0.89

Performance-Enhancing Heuristics Real-Time Localization Framework Tag Selection Tag Binning RSS Decay Models Performance-Enhancing Heuristics Solution Model RSS decay with respect to tag-reader distance and tag orientation

Performance-Enhancing Heuristics Real-Time Localization Framework Tag Selection Tag Binning RSS Decay Models Performance-Enhancing Heuristics Proposed future work Careful use of reference tags? Auto-calibration routines Real-time environmental information Where we’re currently at

Creating a Realistic Deployment Internet RFID Reader Backend Host Tablet Mobile Robot with onboard reader and multi-tag Antenna

Some Results Black Actual location Blue Reported for [ThingMagic, Tag 10] [0.3—1.2m], 0.75m avg* Red Reported for [Alien, Tag 14] [0—1.14m], 0.57m avg* *Ranges and averages include outliers

Have we met the criteria? Adaptive Scalable Accurate Fast Realistic

Real-Time RFID Localization Using RSS Kirti Chawla, Christopher McFarland, Gabriel Robins, Connor Shope Presenter: Christopher McFarland [cem8u@virginia.edu]